This paper examines the effect of accounting conservatism on future investment opportunities using the sample of Thai listed firms during the period of 2005 – 2011. Since information asymmetry between outside shareholders and managers may hurt firms’ values and investment opportunities, accounting conservatism is argued to likely mitigate information asymmetry. The results indicate that conservatism is positively correlated to future investment opportunities consistent with the information role of conservatism in reducing agency costs. This research paper is the first to provide evidence of the benefits of accounting conservatism on future investment opportunities.